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dc.contributor.author
Morrell, Nidia Irene
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dc.contributor.author
Walborn, Nolan Revere
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dc.contributor.author
Arias, Julia Ines
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dc.date.available
2018-03-09T12:43:27Z
dc.date.issued
2005-07
dc.identifier.citation
Morrell, Nidia Irene; Walborn, Nolan Revere; Arias, Julia Ines; A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra; University of Chicago Press; Publications of the Astronomical Society of the Pacific; 117; 833; 7-2005; 699-705
dc.identifier.issn
0004-6280
dc.identifier.uri
http://hdl.handle.net/11336/38387
dc.description.abstract
We have conducted a survey of little-known N iv and O iv multiplets near 3400 A˚ in an extensive sample of well-classified, very early O-type spectra. The initial motivation was to search for additional useful classification criteria for these types, but an unexpected result is the high sensitivity of these features to evolutionary CNO processing. We have found a useful discriminant between O2 and later types in the relative strengths of the O iv multiplets, one of which is subject to selective emission in the hottest spectra; the overall strengths of these lines also decrease between spectral types O4 and O5. More remarkable, however, are the variations in the N/O ratios among both individual stars and clusters. For instance, several O4 If spectra have very large ratios, while main-sequence stars in the Carina Nebula generally have smaller values than others of the same spectral types in other regions. These effects correspond to different degrees of mixing of processed material as a function of evolutionary age and initial rotational velocities; the second effect provides significant further evidence that very massive stars mix while still on the main sequence. Thus, further analysis of these features will likely provide valuable diagnostics of important evolutionary parameters.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
University of Chicago Press
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Abundances
dc.subject
Early Type Stars
dc.subject
Evolution of Stars
dc.subject
Fundamental Parameters
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
A Survey of N IV and O IV Features near 3400 Å in O2-O5 Spectra
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-06T15:11:06Z
dc.journal.volume
117
dc.journal.number
833
dc.journal.pagination
699-705
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Morrell, Nidia Irene. Las Campanas Observatory; Chile
dc.description.fil
Fil: Walborn, Nolan Revere. Space Telescope Science Institute; Estados Unidos
dc.description.fil
Fil: Arias, Julia Ines. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.journal.title
Publications of the Astronomical Society of the Pacific
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1086/430937
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://adsabs.harvard.edu/abs/2005PASP..117..699M
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1086/430937
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